where \(N\)  is the number of nuclei of interest in the
sample (see Table REF ), \(\eta \)  is the detection
efficiency for the \(\gamma \) -ray (X-ray) quanta searched for, \(t\) 
is the measuring time, and \(\lim S\)  is the number of events of the
effect which can be excluded at a given C.L. In the present work
all the \(\lim S\)  values and the half-life limits are given with
90% C.L. The detection efficiencies of the detector system to the
\(\gamma \)  (X-ray) quanta expected in different modes and channels
of the double-beta processes in \(^{190}\) Pt and \(^{198}\) Pt were
simulated with the EGSnrc simulation package
[1]}, [2]}, the decay events were generated
by the DECAY0 events generator [3]}.
